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FREQUENTLY ASKED QUESTIONS

Regarding the installation and general operation of Washtech Dishwashers.


Please refer to the Operator Manual for full installation and operating instructions including tips to optimize the performance of your machine. Contact us for access to our on-line KnowledgeBase for complete technical information including comprehensive Service Manuals for all units.


Back Flow Prevention


As all Washtech machines have Watermark registration no further backflow prevention is required.


Blockages


Wash and Rinse arms and all filters in the wash chamber must be inspected regularly and removed for cleaning if necessary. Refer machine operator manual.


Chemicals


Refer sections on Detergent and Rinse Aid.


Commissioning


Commissioning is part of the correct installation of the machine as explained in the operator manual. We strongly recommend that you use an Authorised Service Provider for Installation


Detergent


Use low-foaming caustic based products from a reputable supplier with good representation - we can recommend one in your area. The machines use approximately 5 ml of detergent per cycle, depending on detergent strength, water consumption of the machine model, washware soil loadings, and the number of cycles between draining of the wash tank. Note that all dishwashing machine detergents - domestic and commercial - are hazardous and must be handled with care. If commercial liquid detergent is unavailable there is no technical problem using domestic powders - put a capful of product into the machine at start up and add a little when performance declines e.g. every five to ten cycles.

Detergent Consumption


Detergent consumption depends on water used per rack times detergent concentration which is commonly about 3 ml per litre. So an M2 using 2.6 litres per cycle would use about 8 ml of detergent per cycle and wash about 125 racks per litre of detergent, plus a little more for machine filling each day.


Detergent Injection


Some models are fitted with detergent injectors. The pump is inside the machine cabinet and has an inlet hose with a weight and filter on the end. Take this hose through the rear or floor of the machine and insert it into your detergent container. The amount of detergent injected into the machine depends on the time that the injector operates, which is controlled by the cam timer which controls all machine functions. Adjustment of this timer should be by the detergent company representative or authorised service provider.


Dimensions


Machine dimensions are shown on our product brochures. Bench detail is shown in Operator and Service Manuals - available on the KnowledgeBase or on request.


Shipping Dimensions


Model

Uncrated Weight

Crated Width

Crated Depth

Crated Height

Crated Vol m3

Crated Weight kg

GA

30

520

610

780

0.25

43

GE

28

520

590

780

0.24

41

XG

29

520

590

780

0.24

42

GM

54

590

570

870

0.29

68

GLV

66

620

650

960

0.38

81

XU

58

710

690

970

0.47

76

UD

68

710

690

970

0.47

86

M1

77

740

700

1450

0.75

101

M2

94

760

830

1450

0.91

125

XP

94

760

830

1450

0.91

125

AL

116

790

950

1450

1.08

151

AL8

150

1000

910

1650

1.50

176

PW1

125

850

850

1790

1.29

165

PW2

230

1310

910

1830

2.18

275

PW3

220

1450

1050

1730

2.63

276

CD100

184

1700

875

1510

2.25

262

CD150

265

2300

875

1510

3.04

350

CD200

340

2905

840

1905

4.65

440

CD260


3600

950

1450

4.70

550


Drain pumps


Drain pumps are standard on GLV and UD models and available as an option on most models. We recommend gravity connection wherever possible, but the optional drain pumps will lift waste water to bench height when required. Read the installation instructions when installing a machine with a drain pump to ensure correct operation.


Draining the machine daily


It is absolutely vital to drain the machine at least once daily and any time that the machine is left idle for more than a few hours. Drain the machine while it is still hot to drain all dirty wash water and oils etc. in the water. Failure to drain the machine daily will cause faults such as the machine running the rinse system continually even though it is full. If this occurs drain the machine and allow it to sit for a few minutes before refilling.


Electrical Requirements


Typically 15 amp single phase for most models up to and including the ME/XP The M2 is standard 25amp single phase or 15 amp 3 phase, neutral and earth - installer may choose preferred connection. AL model and larger machines are all 3 phase, neutral and earth (5 wire) supply. If there is difficulty with these current loadings we can reduce the heating capacity - refer below. Note we can supply machines in special voltages including marine requirements. Potwashers and Conveyor machines are all 3 phase, neutral and earth. All 3 phase equipment must be checked for correct direction of pump rotation following installation.


Electrical Ratings


Kw

phase

amps/ph

minimum

GE

3

1

14

14

GA

3

1

14

14

XG

3

1

14

14

GM

3

1

14

14

XU

4

1

15

15

GLV

4

1

15

15

UD

4

1

15

15

XP

4

1

15

15

M1

4

1

15

15

M2(1)

6

1

25

15

M2(3)

8

3

11

11

AL

9

3

15


AL8

17

3

25


PW1

9

3

15


PW2

18

3

30


PW3

18

3

30


CD100

17

3

25


CD1006D

24

3

35


CD1009D

27

3

37


CD10012D

30

3

40


CD150

19

3

30


CD1506D

26

3

35


CD15012D

32

3

45


CD15018D

38

3

55


CD200

21

3

32

CD2006D

28

3

42


CD20012D

35

3

50



Installation


Refer the Operator Manual for complete installation instructions. Use experienced and qualified installation personnel for assurance of correct installation. Refer also FAQs on Electrical, Waste and Water Supply. Maintenance


Hard working machinery needs regular maintenance and the dishwasher is one of the hardest working machines in the kitchen. We provide maintenance programs to protect the investment in your machine, reduce downtime and provide a report confirming that your machine is sanitising dishes as it should - a useful hygiene assurance tool.


Moving machines for cleaning


The UD and GLV models are designed to be moved for cleaning. Wheels are fitted to the rear of these machines - drain the machine, close the door and use the door handle to lift the front of the machine slightly and gently pull the machine from the recess. Be sure to check that the drain hose is in place before pushing the machine back. Other models stand on 150mm legs to provide cleaning access beneath the machine.


Overflow


If your machine is overflowing onto the floor this is usually caused by a blocked drain which a plumber can remedy. GLV and UD models are fitted with drain pumps as standard and failure of these pumps can cause the machine to overflow.


Quality Assurance


Washtech is an ISO 9001 Quality Assured Supplier - audited regularly by BVQI to confirm compliance with this prestigious standard.


Rack Sizes - glassracks and dishracks

AL, CD, UE, XU, UD, ME, XP, M2

500mm

GLV, M1

450mm

GM

435mm

XG, GE, GA

365mm


Regulations


Washtech machines comply with all local codes and requirements.


Rinse Aid


Also known as Rinse Fluid, or Drying Agent - injectors are generally not fitted as standard but are available as an option, or from your chemical supplier. About 5 ml of rinse fluid is used per cycle, depending on factors such as product type, water hardness etc. Rinse Aid promotes faster drying of washware.


Rinse Pump requirement


Rinse pumps are available with our machines, but they are not generally required, as water supply pressure normally exceeds 2 bar = 200kpA = 30 psi. Water flow rate of 20 litres per minute is required. Rule of thumb is that if you can stop the flow of hot water out of a tap on your premises with your thumb, then you do need a rinse booster..


Serial Number


The serial number of your machine is normally found in the label on the lower right corner of the front of the machine, preceded by the model e.g. GLV123456.


Service calls - Machine not working


Before calling for service first check that the power and water supply are turned on and the drain upstand and all filters are in place. If the machine is full of water remove the drain upstand, drain the machine and then try refilling it. Check that the door is properly closed. Note which control lights on the panel are lit up and also note the model and serial number from the label - usually lower right corner of the front of the machine.

Service Providers


Contact us for detail on your local authorised Washtech Service Provider.


Sterilisation / Sanitisation


Our machines do not sterilise - this requires temperatures over 100oC. They do sanitise as defined by Food Hygiene Regulations i.e the machine will not operate unless it can deliver rinse water over 83oC to the washware for ten seconds.


Temperature Compliance Food Hygiene Regulations


Washtech machines are guaranteed to comply with food hygiene regulations. If there is any question about a machine complying please contact us.

Temperature Adjustment


Must be carried out by a qualified technician who can adjust wash and / or rinse thermostats.


Ventilation / Extraction


Refer local codes and local authorities for their interpretation of codes. Conveyor machines typically require around 200 litres per second extraction if connected directly. Where canopies are installed full consideration must be given of the size and characteristics of the room - consult ventilation expert.


Warranty


Many Washtech machines carry a 5 2 1 warranty - 5 years on the cabinet, 2 years on the wash pump and 1 year complete cover. Extended warranties and preventative maintenance agreements are available on request.


Wash Performance


Read the Operator Manual, check that you have good quality detergent being injected at correct levels, follow operating procedures and you will get excellent wash performance from your Washtech dishwasher. Pre-rinsing is recommended but pre-washing is not required except for heavy soiling with baked or dried on foods. If you are not pleased with wash performance - contact us.


Wash Tank Capacities


Approximate wash tank capacities in litres are as follows:


GE, GA

n/a

XG, GLV, UD

10

GM

15

XU, UE, M1

20

XP, M2, AL, PW1

30

AL8

40

CD100, PW2 , PW3

80


Waste Requirements - Copper or P.V.C.


PVC is less expensive, easier to install and more resistant to some harsh detergents. Some authorities sometimes suggest that copper is required because the machine rinses at up to 90oC. Please note however that the rinse water mixes with the 65oC wash water before discharge, and then flows into the trap, where the water is cooled further, before entering the drainage plumbing. We have thousands of machines installed on PVC waste systems and provided the PVC is properly installed, and supported as specified then there are no problems with it, but if in doubt contact your local authority.


Water Consumption


Most models use less than 3 litres per cycle except the GE which uses about 6. Note that on multicycle machines, no more water is consumed on long cycles than on short – so use the long cycle whenever possible to ensure the best results.


Water Flow Rate


Flow rate required is 20 litres per minute. 3 litres delivered in 12 seconds equates to 15 litres per minute minimum, so your water system should be capable of more than this – say 20 litres per minute. This means that many instantaneous hot water systems are NOT suitable. Talk to your plumber, but make sure that they understand that although the consumption is around 3 litres per cycle, this amount must be delivered within the time of 12 seconds.


Water Supply Instantaneous Heaters


Provided they have a flow rate of more than 15 litres per minute these units can be an acceptable option for hot water supply - refer Water Flow Rate. However if the kitchen is not busy and the heater is some distance from the machine there can be issues. Usually it takes a few seconds of water flow for the heater to come to temperature - the first water discharged is not hot. By the time the water is hot the machine cycle may be finished. This water cools in the lines before the next cycle, etc. so the machine never receives hot water, resulting in delays between cycles. No problem if the kitchen is busy and the lines are kept filled with hot water. Check the water in a tap adjacent to the machine - if it is not hot, then the machine is not getting hot water.


Water Supply Specification


We recommend soft potable hot water supply of 65oC , 200 - 350 kPa pressure, 20 litres per minute flow rate. When pressure and flow are below this range a rinse booster pump is required. Above the specified pressure range a pressure limiter must be fitted. Temperature below specification may cause delays between machine operating cycles.

Cold water supply is not recommended, but possible for all models except the GE. Contact us if you are in a situation where there is difficulty meeting our water supply specification for hot water supply.

Our full water quality specification is:

Hardness

fH

dH

ppm

gr/gal


pH

min

2

1

20

1


7

max

10

6

100

6


8








Ions

CI-

SO4

Fe

Mn

Cu

CI2

max mg/l

100

400

0.1

0.05

0.05

0.1


Water Supply - Hot Water Cylinder Sizing


Failure to provide adequate hot water supply will result in delays between dishwasher operating cycles, so correct hot water cylinder sizing is important. This obviously depends on how much you use the machine. Most models use 3 litres or less per cycle – multiply this by the number of cycle per hour you expect to use the machine. The heat rise required is about 50oC, that is you need to heat the water from about 15oC to 65oC. 1kW of heating will recover about 15 litres of hot water in one hour for a 50oC rise. So for every 5 dishwasher cycles per hour you need 1kW of heating element for continuous use. With a common 3kW element, you can do 15 cycles per hour, which would be about 270 plates in an M2 model dishwasher. Storage capacity does help to even out peak usage so you could probably get 25 cycles out of a 180 litre electric cylinder with a 3kW element in the first hour, but would experience delays between cycles after that time. Gas cylinders generally provide much faster recovery than electric and are recommended for this reason. A standard gas cylinder has an equivalent of about 7.5kW rating, so you should get more than 35 cycles per hour – continuous use – out of a standard gas cylinder – which is a high use rate. Caution – consider all the other uses you have for hot water in addition to the dishwasher. We strongly recommend pre-rinsing with a Fisher pre-rinse gun and cold water is entirely appropriate for pre-rinsing – if hot is used this is obviously an additional use. Note also that if your water temperature is kept below 55oC, to prevent scalding, that this is lower than the supply temperature specified for the dishwashers and can result in delays between cycles.


Wet Dishes


Commercial Dishwashers do not incorporate a drying cycle - they wash and then rinse with very hot water and dishracks should then be removed and placed on the bench for a few minutes for dishes to dry. Provided correct detergent and rinse fluids are used most items - other than plastics - will dry rapidly. If the rack is left in the machine with the door closed at the end of the cycle, the dishes will not dry.